Up to 500 secondary schools face closure next month if teachers go on strike as expected.
ASTI executives are meeting to discuss what form their industrial action will take after members voted to strike.
Teachers are angry that those who qualified after 2011 are paid less than their colleagues, and want the payment for supervision to be restored.
Over 13 thousand secondary school teachers were balloted by their union who recommended – and got – a yes vote for strike action, with around 80 percent in favour.
The timing is crucial, because it wouldn't give the Department of Education enough time to hire extra staff who haven't been Garda vetted, and hundreds of schools would have to close.
Dublin teacher Keith Burke says he believes they have parents' support and it's a matter of fairness that they go on strike to get equal pay for equal work.
Teachers in the TUI and the INTO have agreed to a partial restoration of newer members' pay – something ASTI says is not acceptable.
But Education Minister Richard Bruton says they can't afford to restore all pay now;
We're expecting to find out the details of the strikes later this afternoon.
